Boiler Pressure Gauges | McMaster-Carr

	Connection Location Connection Location

	Bottom		Center Back

	Pipe Size Pipe Size

1/4

1/2

	For Use With For Use With

	Scale Scale

	Measures Measures

Pressure

Temperature

	Scale Type Scale Type


Dual	Single

	Dial Diameter Dial Diameter

	Stem Length Stem Length

1 1/2"

	Maximum Process Temperature Maximum Process Temperature

140° F

150° F

320° F

	Case Material Case Material

Steel

Aluminum

	Lens Material Lens Material

Plastic

Glass

	Accuracy Grade Accuracy Grade

	Mounting Orientation Mounting Orientation

Any Angle

Upright

	Maximum Environment Temperature Maximum Environment Temperature

140° F

150° F

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Minimum Process Temperature Minimum Process Temperature

-40° F

70° F

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant with
Exemptions

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Numeric Increments, psi Numeric Increments, psi

	Graduation Marks, psi Graduation Marks, psi

	Maximum Pressure, psi Maximum Pressure, psi

	Numeric Increments, ft. of H2O Numeric Increments, ft. of H2O

50 ft. of H2O

100 ft. of H2O

	Maximum Pressure , ft. of H2O Maximum Pressure , ft. of H2O

7 Products

About Pressure Gauges

About Pipe Size

Bottom Connection

Center Back Connection

Designed for use with boilers, these gauges have a dual scale that displays pressure in psi and feet of H₂O and displays temperature in °F/°C.

Painted Steel Case with Brass Connection—Dual Scale (psi/ft. of H₂O, Fahrenheit/Celsius)

For Use With: Steam and Water
Accuracy: ±2.5% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	ft. of H₂O	psi	ft. of H₂O	psi	ft. of H₂O
2 1/2" Dial Dia.
0 to 75	0 to 170	5	10	20	50
3 1/4" Dial Dia.
0 to 100	0 to 230	2	10	20	50
0 to 200	0 to 460	5	20	40	100

		Display Temp. Range
Dial Diameter	Pipe Size	°F	°C	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Mounting Orientation	Stem Lg.	Shoulder Lg.		Each
Bottom Connection
NPT Male
3 1/4"	1/2	70° to 320°	20° to 160°	-40° to 140°	70° to 320°	Black	Any	2"	__	0000000	000000
Center Back Connection
NPT Male
2 1/2"	1/4	70° to 320°	20° to 160°	-40° to 140°	70° to 320°	Black	Any	1"	__	0000000	00000
2 1/2"	1/4	70° to 320°	20° to 160°	-40° to 140°	70° to 320°	Black	Any	1"	2"	0000000	00000
2 1/2"	1/4	70° to 320°	20° to 160°	-40° to 140°	70° to 320°	Black	Any	1 1/2"	2"	0000000	00000
3 1/4"	1/2	70° to 320°	20° to 160°	-40° to 140°	70° to 320°	Black	Any	2"	__	0000000	00000

Large-Dial High-Accuracy Pressure Gauges

Single Scale With Bottom Connection (Flange Mount)

Dual Scale With Bottom Connection

Bottom Connection (Flange Mount)

Read your pressure from a distance with these large-dial gauges. Use them with pumps, filters, regulators, and in process lines to measure and display pressure. They are suitable for critical processes that require high accuracy, such as hydraulic and laboratory applications. Mount gauges with the dial face upright.

Gauges with aluminum case have better corrosion resistance than gauges with steel case.

For technical drawings and 3-D models, click on a part number.

Painted Aluminum Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, and Hydraulic Fluid
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 30	0.5	5
0 to 60	1	10
0 to 100	2	20
0 to 200	2	20
0 to 300	5	50
0 to 400	4	50
0 to 600	10	50

					Mounting		Bolt			Flange		Bottom Connection (Flange Mount)
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Orientation	Fasteners Included	Circle Dia.	Hole Dia.	No. of Holes	Location	OD		Each
NPT Male
8 1/2"	1/4	-40° to 150°	-40° to 150°	Black	Upright	No	9 5/8"	13/64"	3	Back	10 1/4"	0000000	0000000

Painted Steel Case with Brass Connection—Dual Scale (psi, bar)

For Use With: Air, Water, and Hydraulic Fluid
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	bar	psi	bar	psi	bar
0 to 30	0 to 2.06	0.5	0.02	5	0.2
0 to 60	0 to 4.1	1	0.05	10	0.5
0 to 100	0 to 6.8	1	0.1	10	1
0 to 200	0 to 13.6	2	0.2	20	2
0 to 300	0 to 20.6	5	0.2	50	2
0 to 400	0 to 27.5	5	0.5	50	5
0 to 600	0 to 41	10	0.5	100	5

						Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Mounting Orientation		Each
NPT Male
10"	1/2	-40° to 140°	-40° to 140°	Black	Upright	0000000	0000000

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About Pressure Gauges

About Pipe Size

Steam Pressure Gauges

Large-Dial High-Accuracy Pressure Gauges